6AS7 SE Amplifier

Several years ago, this amplifier had been designed
for one of my kit set. I believe that some of you might have seen this before in
Taiwanese web page. Not much here, just a gallery of my previous work and
some simple test result.

This is my prototype PCB for easier construction.

All metal casing with epoxy paint. Pre-installed with power
transformer and terminals.

This is my homebrew prototype output trans with 4 layers of
primary and 3 layers of secondary.1kohm : 8 ohm.

Here's how I hide the ugly OPT.

Everything looks simple with double sided PCB.

Response of 100Hz.

1 KHz square wave.

And here's 10KHz square wave.

The output power is 2.5W before clipping and distortion is
around 3.8% at 2W rms.